YOU SAID:
There was once a really big house
INTO JAPANESE
かつて本当に大きな家がありました
BACK INTO ENGLISH
Once upon a time, there was a really big house.
INTO JAPANESE
昔々、本当に大きな家がありました。
BACK INTO ENGLISH
Once upon a time, there was a really big house.
That didn't even make that much sense in English.